<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    <script>
        var X=10;
        //
        //var name,age,gender
        var name="小明",age=18,gender="男";
        console.log("log输出");
        console.log("错误输出")
        console.warn("警告")
    </script>
</body>
</html>